Finding the Fourth Proportional to 72,728.68, 108,379.73 and 72,116.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72,728.68 : 108,379.73 = 72,116.32 : x
2. Step 2: Convert to fraction form
   72,728.68/108,379.73 = 72,116.32/x
3. Step 3: Cross multiply
   72,728.68x = 108,379.73 × 72,116.32
4. Step 4: Simplify right side
   72,728.68x = 7,815,947,290.19
5. Step 5: Solve for x
   x = 7,815,947,290.19/72,728.68
6. Step 6: Final answer
   x = 107,467.20